Robtex

Up: 72.1.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.1.32.0/20
Down right: 72.1.48.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.1.32.14	A	outdoorsportshow.com
72.1.32.14	A	atdns2b.alliancetech.com
72.1.32.151	A+PTR	ns1.domaindiscover.com
72.1.32.158	A+PTR	tierra.net
72.1.32.158	A	domaindiscover.com
72.1.32.158	A	www.domaindiscover.com
72.1.32.168	A	davidmckitrick.com
72.1.32.168	A	advamas.biz
72.1.32.168	A	eroticpjs.com
72.1.33.3	A+PTR	ns1-colo.tierra.net
72.1.33.5	A+PTR	url1-colo.tierra.net
72.1.33.5	A	kimberlynewman.com
72.1.33.5	A	alertml.net
72.1.33.6	PTR	url2-colo.tierra.net
72.1.33.6	A	kimberlynewman.com
72.1.33.6	A	alertml.net
72.1.33.139	PTR	numberbarn.com
72.1.33.143	A	signsplat.com
72.1.40.16	A+PTR	airrents.com
72.1.40.35	A	subfra.me
72.1.40.82	A+PTR	faxferret.com
72.1.40.83	A+PTR	theramonan.com
72.1.46.1	PTR	gi2-0.poway.tierra.net
72.1.46.3	A	nat.phone.com
72.1.46.8	A	sip-beta.phone.com
72.1.46.10	A	sip.phone.com
72.1.46.31	A	adm01-san.phone.com
72.1.46.55	A	clock.phone.com
72.1.46.56	A	clock.phone.com
72.1.46.57	A	stun.phone.com
72.1.46.71	A	vmhost1.phone.com
72.1.46.83	A	*.phone.com
72.1.46.83	A	phonedot.com
72.1.46.83	A	beta.phone.com
72.1.46.98	A+PTR	syslog.phone.com
72.1.46.101	PTR	phone.com
72.1.46.102	A	sandbox1.phone.com
72.1.46.106	A	supportphd.com
72.1.46.106	A	www.supportphd.com
72.1.46.151	A	ns1.san.phone.com
72.1.46.152	A	ns2.san.phone.com
72.1.46.199	A	provisioningphone.com
72.1.46.221	A+PTR	sip05.phone.com
72.1.47.231	A+PTR	lb1.phoenix.phone.com
72.1.47.231	A	api.phone.com
72.1.47.232	A+PTR	lb2.phoenix.phone.com
72.1.47.232	A	api.phone.com
72.1.48.1	A	off-g-vl4.ntinet.com
72.1.48.2	A	cam-f2.ntinet.com
72.1.48.6	A	bow-f4.ntinet.com
72.1.48.9	A	cam-f5.ntinet.com
72.1.48.49	A	san-f5.ntinet.com
72.1.48.54	A	hhl-f5.ntinet.com
72.1.48.57	A	eut-f7.ntinet.com
72.1.48.58	A	hhl-f2.ntinet.com
72.1.48.69	A	hhl-f3.ntinet.com
72.1.48.130	A+PTR	ns1.ntinet.com
72.1.48.130	A	ns01.ntinet.com
72.1.48.131	A+PTR	ns2.ntinet.com
72.1.48.131	A	ns02.ntinet.com
72.1.48.133	PTR	ns4.ntinet.com
72.1.48.152	A	orangeburgonline.com
72.1.48.161	A	plat.ntinet.com
72.1.48.162	A	portal.ntinet.com
72.1.48.162	A	customer.ntinet.com
72.1.48.175	PTR	ntinetinc.com
72.1.48.175	A	orangeburgonline.com
72.1.48.240	A+PTR	e-gate2.ntinet.com
72.1.48.240	A	e-gate1.ntinet.com
72.1.48.247	A	wireless.ntinet.com
72.1.48.252	A	platdsvc.ntinet.com
72.1.53.96	PTR	san-dhcp-96.wireless.ntinet.com
72.1.53.128	PTR	san-dhcp-128.wireless.ntinet.com
72.1.53.129	PTR	san-dhcp-129.wireless.ntinet.com
72.1.53.131	PTR	san-dhcp-131.wireless.ntinet.com
72.1.53.160	PTR	san-dhcp-160.wireless.ntinet.com
72.1.53.224	PTR	san-dhcp-224.wireless.ntinet.com
72.1.56.66	A+PTR	officevoip.ntinet.com
72.1.56.253	A	ndp1.ntinet.com
72.1.62.104	A	akkineni.com
72.1.62.222	A+PTR	mail.c21themooregroup.com
72.1.62.222	A	mail2.c21themooregroup.com
72.1.62.222	A	mail2.c21tmg.com
72.1.63.2	A	internaldevcore.com